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For Worcester's five high schools, White estimated the cost of installing metal detector systems would run from $73,000 to $91,250. He noted given the school populations, four or five units would likely be needed to move students through in the morning. One handheld wand per unit is also included in the price.
''Like any other electronic device,'' he said, ''smoke detectors have a useful life.''. But the exact length of that life span is unknown. Some fire-safety officials say it is about 10 years, but there has been little research into the life span of detectors. One manufacturer, the Pittway Corporation, which makes about 70 percent of the detectors sold in the United States, recommends that a detector be discarded after 10 years.